1 /* 2 * (C) Copyright 2007-2008 Semihalf 3 * 4 * Written by: Rafal Jaworowski <raj@semihalf.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <config.h> 10 #include <common.h> 11 #include <api_public.h> 12 13 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE) 14 #include <usb.h> 15 #endif 16 17 #define DEBUG 18 #undef DEBUG 19 20 #ifdef DEBUG 21 #define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0) 22 #else 23 #define debugf(fmt, args...) 24 #endif 25 26 #define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0) 27 28 29 #define ENUM_IDE 0 30 #define ENUM_USB 1 31 #define ENUM_SCSI 2 32 #define ENUM_MMC 3 33 #define ENUM_SATA 4 34 #define ENUM_MAX 5 35 36 struct stor_spec { 37 int max_dev; 38 int enum_started; 39 int enum_ended; 40 int type; /* "external" type: DT_STOR_{IDE,USB,etc} */ 41 char *name; 42 }; 43 44 static struct stor_spec specs[ENUM_MAX] = { { 0, 0, 0, 0, "" }, }; 45 46 47 void dev_stor_init(void) 48 { 49 #if defined(CONFIG_CMD_IDE) 50 specs[ENUM_IDE].max_dev = CONFIG_SYS_IDE_MAXDEVICE; 51 specs[ENUM_IDE].enum_started = 0; 52 specs[ENUM_IDE].enum_ended = 0; 53 specs[ENUM_IDE].type = DEV_TYP_STOR | DT_STOR_IDE; 54 specs[ENUM_IDE].name = "ide"; 55 #endif 56 #if defined(CONFIG_CMD_MMC) 57 specs[ENUM_MMC].max_dev = CONFIG_SYS_MMC_MAX_DEVICE; 58 specs[ENUM_MMC].enum_started = 0; 59 specs[ENUM_MMC].enum_ended = 0; 60 specs[ENUM_MMC].type = DEV_TYP_STOR | DT_STOR_MMC; 61 specs[ENUM_MMC].name = "mmc"; 62 #endif 63 #if defined(CONFIG_CMD_SATA) 64 specs[ENUM_SATA].max_dev = CONFIG_SYS_SATA_MAX_DEVICE; 65 specs[ENUM_SATA].enum_started = 0; 66 specs[ENUM_SATA].enum_ended = 0; 67 specs[ENUM_SATA].type = DEV_TYP_STOR | DT_STOR_SATA; 68 specs[ENUM_SATA].name = "sata"; 69 #endif 70 #if defined(CONFIG_CMD_SCSI) 71 specs[ENUM_SCSI].max_dev = CONFIG_SYS_SCSI_MAX_DEVICE; 72 specs[ENUM_SCSI].enum_started = 0; 73 specs[ENUM_SCSI].enum_ended = 0; 74 specs[ENUM_SCSI].type = DEV_TYP_STOR | DT_STOR_SCSI; 75 specs[ENUM_SCSI].name = "scsi"; 76 #endif 77 #if defined(CONFIG_CMD_USB) && defined(CONFIG_USB_STORAGE) 78 specs[ENUM_USB].max_dev = USB_MAX_STOR_DEV; 79 specs[ENUM_USB].enum_started = 0; 80 specs[ENUM_USB].enum_ended = 0; 81 specs[ENUM_USB].type = DEV_TYP_STOR | DT_STOR_USB; 82 specs[ENUM_USB].name = "usb"; 83 #endif 84 } 85 86 /* 87 * Finds next available device in the storage group 88 * 89 * type: storage group type - ENUM_IDE, ENUM_SCSI etc. 90 * 91 * first: if 1 the first device in the storage group is returned (if 92 * exists), if 0 the next available device is searched 93 * 94 * more: returns 0/1 depending if there are more devices in this group 95 * available (for future iterations) 96 * 97 * returns: 0/1 depending if device found in this iteration 98 */ 99 static int dev_stor_get(int type, int first, int *more, struct device_info *di) 100 { 101 int found = 0; 102 *more = 0; 103 104 int i; 105 106 struct blk_desc *dd; 107 108 if (first) { 109 di->cookie = (void *)blk_get_dev(specs[type].name, 0); 110 if (di->cookie == NULL) 111 return 0; 112 else 113 found = 1; 114 115 /* provide hint if there are more devices in 116 * this group to enumerate */ 117 if (1 < specs[type].max_dev) 118 *more = 1; 119 120 } else { 121 for (i = 0; i < specs[type].max_dev; i++) 122 if (di->cookie == 123 (void *)blk_get_dev(specs[type].name, i)) { 124 /* previous cookie found -- advance to the 125 * next device, if possible */ 126 127 if (++i >= specs[type].max_dev) { 128 /* out of range, no more to enum */ 129 di->cookie = NULL; 130 break; 131 } 132 133 di->cookie = (void *)blk_get_dev( 134 specs[type].name, i); 135 if (di->cookie == NULL) 136 return 0; 137 else 138 found = 1; 139 140 /* provide hint if there are more devices in 141 * this group to enumerate */ 142 if ((i + 1) < specs[type].max_dev) 143 *more = 1; 144 145 break; 146 } 147 } 148 149 if (found) { 150 di->type = specs[type].type; 151 152 if (di->cookie != NULL) { 153 dd = (struct blk_desc *)di->cookie; 154 if (dd->type == DEV_TYPE_UNKNOWN) { 155 debugf("device instance exists, but is not active.."); 156 found = 0; 157 } else { 158 di->di_stor.block_count = dd->lba; 159 di->di_stor.block_size = dd->blksz; 160 } 161 } 162 163 } else 164 di->cookie = NULL; 165 166 return found; 167 } 168 169 170 /* 171 * returns: ENUM_IDE, ENUM_USB etc. based on struct blk_desc 172 */ 173 static int dev_stor_type(struct blk_desc *dd) 174 { 175 int i, j; 176 177 for (i = ENUM_IDE; i < ENUM_MAX; i++) 178 for (j = 0; j < specs[i].max_dev; j++) 179 if (dd == blk_get_dev(specs[i].name, j)) 180 return i; 181 182 return ENUM_MAX; 183 } 184 185 186 /* 187 * returns: 0/1 whether cookie points to some device in this group 188 */ 189 static int dev_is_stor(int type, struct device_info *di) 190 { 191 return (dev_stor_type(di->cookie) == type) ? 1 : 0; 192 } 193 194 195 static int dev_enum_stor(int type, struct device_info *di) 196 { 197 int found = 0, more = 0; 198 199 debugf("called, type %d\n", type); 200 201 /* 202 * Formulae for enumerating storage devices: 203 * 1. if cookie (hint from previous enum call) is NULL we start again 204 * with enumeration, so return the first available device, done. 205 * 206 * 2. if cookie is not NULL, check if it identifies some device in 207 * this group: 208 * 209 * 2a. if cookie is a storage device from our group (IDE, USB etc.), 210 * return next available (if exists) in this group 211 * 212 * 2b. if it isn't device from our group, check if such devices were 213 * ever enumerated before: 214 * - if not, return the first available device from this group 215 * - else return 0 216 */ 217 218 if (di->cookie == NULL) { 219 220 debugf("group%d - enum restart\n", type); 221 222 /* 223 * 1. Enumeration (re-)started: take the first available 224 * device, if exists 225 */ 226 found = dev_stor_get(type, 1, &more, di); 227 specs[type].enum_started = 1; 228 229 } else if (dev_is_stor(type, di)) { 230 231 debugf("group%d - enum continued for the next device\n", type); 232 233 if (specs[type].enum_ended) { 234 debugf("group%d - nothing more to enum!\n", type); 235 return 0; 236 } 237 238 /* 2a. Attempt to take a next available device in the group */ 239 found = dev_stor_get(type, 0, &more, di); 240 241 } else { 242 243 if (specs[type].enum_ended) { 244 debugf("group %d - already enumerated, skipping\n", type); 245 return 0; 246 } 247 248 debugf("group%d - first time enum\n", type); 249 250 if (specs[type].enum_started == 0) { 251 /* 252 * 2b. If enumerating devices in this group did not 253 * happen before, it means the cookie pointed to a 254 * device frome some other group (another storage 255 * group, or network); in this case try to take the 256 * first available device from our group 257 */ 258 specs[type].enum_started = 1; 259 260 /* 261 * Attempt to take the first device in this group: 262 *'first element' flag is set 263 */ 264 found = dev_stor_get(type, 1, &more, di); 265 266 } else { 267 errf("group%d - out of order iteration\n", type); 268 found = 0; 269 more = 0; 270 } 271 } 272 273 /* 274 * If there are no more devices in this group, consider its 275 * enumeration finished 276 */ 277 specs[type].enum_ended = (!more) ? 1 : 0; 278 279 if (found) 280 debugf("device found, returning cookie 0x%08x\n", 281 (u_int32_t)di->cookie); 282 else 283 debugf("no device found\n"); 284 285 return found; 286 } 287 288 void dev_enum_reset(void) 289 { 290 int i; 291 292 for (i = 0; i < ENUM_MAX; i ++) { 293 specs[i].enum_started = 0; 294 specs[i].enum_ended = 0; 295 } 296 } 297 298 int dev_enum_storage(struct device_info *di) 299 { 300 int i; 301 302 /* 303 * check: ide, usb, scsi, mmc 304 */ 305 for (i = ENUM_IDE; i < ENUM_MAX; i ++) { 306 if (dev_enum_stor(i, di)) 307 return 1; 308 } 309 310 return 0; 311 } 312 313 static int dev_stor_is_valid(int type, struct blk_desc *dd) 314 { 315 int i; 316 317 for (i = 0; i < specs[type].max_dev; i++) 318 if (dd == blk_get_dev(specs[type].name, i)) 319 if (dd->type != DEV_TYPE_UNKNOWN) 320 return 1; 321 322 return 0; 323 } 324 325 326 int dev_open_stor(void *cookie) 327 { 328 int type = dev_stor_type(cookie); 329 330 if (type == ENUM_MAX) 331 return API_ENODEV; 332 333 if (dev_stor_is_valid(type, (struct blk_desc *)cookie)) 334 return 0; 335 336 return API_ENODEV; 337 } 338 339 340 int dev_close_stor(void *cookie) 341 { 342 /* 343 * Not much to do as we actually do not alter storage devices upon 344 * close 345 */ 346 return 0; 347 } 348 349 350 lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start) 351 { 352 int type; 353 struct blk_desc *dd = (struct blk_desc *)cookie; 354 355 if ((type = dev_stor_type(dd)) == ENUM_MAX) 356 return 0; 357 358 if (!dev_stor_is_valid(type, dd)) 359 return 0; 360 361 if ((dd->block_read) == NULL) { 362 debugf("no block_read() for device 0x%08x\n", cookie); 363 return 0; 364 } 365 366 return dd->block_read(dd, start, len, buf); 367 } 368